[Xen-bugs] [Bug 1784] New: Poor performance when do guest save/restore and migration with linux 3.1 dom0

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1784

           Summary: Poor performance when do guest save/restore and
                    migration with linux 3.1 dom0
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: xudong.hao@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32e
Guest Arch (ia32/ia32e/IA64): ia32e
Guest OS Type (Linux/Windows): RHEL6u1
Change Set: 23791
Dom0 commit: linux upstream 3.1.0-rc3 671ee7f0ce62e4b991b47fcf1c161c3f710dabbc
Hardware: Westmere-EP
Other:


Bug detailed description:
--------------------------
I create a rhel6u1 guest, then do the save/restore and
migration, it takes quite a lot of time to finish the process. The network
works well after the save/restore and migration. please see the performance
comparison between linux pvops 2.6.32 and 3.1.0-rc3 as below.

Data below is based on WSM-EP
==============================================================
kernel version        save       restore    migration
==============================================================
vmlinux-2.6-xen        19s         14s     30s    
vmlinux-3.1.0-rc3+    54s          26s     75s        
==============================================================



Reproduce steps:
----------------
1. create a guest
2. do the save/restore or migration


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